IPosition le = source.Positions.GetLastActiveForSignal("Long2");

                
if (le == null)
{
source.Positions.BuyIfLess(i + 1, 1, source.Bars[i].Low - shift, "Long2");
}
else
{
 le.CloseAtProfit(i + 1, le.EntryPrice + profit, "L_profit");
}